/Engine/Source/Editor/AssetDefinition/Public/AssetDefinition.h
Optionally returns a custom widget to overlay on top of this assets' thumbnail
virtual [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > GetThumbnailOverlay ( const [FAssetData](API\Runtime\CoreUObject\AssetRegistry\FAssetData) & InAssetData ) const